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Questions and Answers
What is the primary muscle involved in trunk flexion?
What is the primary muscle involved in trunk flexion?
Which of the following muscles acts as accessory muscles during trunk flexion?
Which of the following muscles acts as accessory muscles during trunk flexion?
What is a factor that limits the range of motion in trunk flexion?
What is a factor that limits the range of motion in trunk flexion?
Where does the range of motion of trunk flexion primarily take place?
Where does the range of motion of trunk flexion primarily take place?
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What is the nerve supply for the rectus abdominis muscle?
What is the nerve supply for the rectus abdominis muscle?
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Study Notes
Trunk Flexion
- Objectives: Students will be able to identify the primary muscles involved in trunk flexion and the range of motion for trunk flexion.
Primary Muscles
- Rectus abdominis: A primary muscle for trunk flexion.
Accessory Muscles
- Internal obliques
- External obliques
Range of Motion & Fixation
- Back lying position: Flexion of thorax on pelvis until scapulae are lifted from the table, primarily in the thoracic spine. The motion continues to sitting position due to hip flexors' reverse action with abdominal muscles acting as stabilizers.
Factors Limiting Motion
- Tightness in posterior longitudinal ligaments, ligamentum flavum, interspinal and supraspinal ligaments.
- Tension in spinal extensor muscles.
- Compressing the intervertebral fibrocartilages.
- Contact between lower ribs and abdomen.
Anatomy of Rectus Abdominis
- Origin: Crest of pubis, ligaments covering front of symphysis pubis.
- Insertion: Three portions into cartilages of fifth, sixth, and seventh ribs.
- Nerve supply: Lower intercostal nerves.
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Description
This quiz delves into the crucial aspects of trunk flexion, focusing on the primary and accessory muscles involved. It also covers the range of motion and factors that can limit this motion, emphasizing the anatomy of the rectus abdominis. Test your understanding of these important concepts related to physical anatomy and movement.
